it is sufficient. But as there are many changes in the SDK, a simple recompile does not work (like was done before for v2). This is no rocket science, someone with a bit knowledge of symbian can do that in a few days.

If you run into problems about signing apps or time problems ( expire date ) you can try to set the date back to one year earlier to test the sdk.I use this small lag to test apps on symbian os v3 ( Nokia E50 ) when i encounter the problems signning apps on V3.